Blumenthal said Spring Hill Farm Dairy has since installed a filter that is removing PFAS from its water, which is widely sold under different names.

A consumption advisory issued by the state of Massachusetts cautioned about water produced before July 24, 2019 in containers ranging from 1 to 2.5 gallons.

Credit Massachusetts Department of Public Health

Commissioner of the Department of Consumer Protection in Connecticut, Michelle Seagull, said she's aware there may be concerns about water that's already on store shelves ahead of the company's action, but removing it would require a federal decision.

"The reality is it's through the FDA that a recall or other situation would occur where these products would be taken off the shelf," she said Monday.

"We're definitely in consultation with our partners at Public Health here in Connecticut. and with Massachusetts and federal counterparts to understand what the situation is, and should more be done."